Housing for slide rules and the like



May 6, 1969 MULLER 3,442,314

HOUSING FOR SLIDE RULES AND THE LIKE Filed March 7, 1967 Fig. 1. Fig. 2.Fig. 3.

b b F W $4 1 a L i J United States Patent m 3,442,314 HOUSING FOR SLIDERULES AND THE LIKE Friedrich Miiller, Hamburg, Germany, assignor toDennert & Pape Aristo-Werke KG, Hamburg, Germany Filed Mar. 7, 1967,Ser. No. 621,257 Claims priority, application Germany, Mar. 10, 1966, D32,946 Int. Cl. A45c 1/04; A45f 5/02; B65d 85/00 US. Cl. 15052 6 ClaimsABSTRACT OF THE DISCLOSURE The present invention concerns a housing,especially for slide rules, which comprises a casing of approximatelyrectangular cross section which is open at the top and closed at thebottom and consists of a substantially stiff shape-retaining syntheticmaterial while a closure cap or flap of flexible material is firmlyconnected to the upper portion of the casing for selectively closing andopening the upper end of said casing. The flap has one end thereofprovided with perforations while the back side of the casing is providedwith protrusions extending through said perforations and connected tothe loop extending around the upper portion of the casing, saidprotrusions connecting the flap to the casing.

The present invention relates to a casing for slide rules. Housings forslide rules and the like are known which comprise an open casing and aseparate cap adapted to be placed on said casing, the casing and the capconsisting of the same material.

It is an object of the present invention to provide a casing for sliderules or the like which is particularly wear resistant and has a longlife.

It is also an object of this invention to provide a housing for sliderules and the like which is easy to handle.

These and other object and advantages of the invention will appear moreclearly from the following specification in connection with theaccompanying drawing, in which:

FIG. 1 shows the rear view of a housing according to the presentinvention.

FIG. 2 is a side view and a partial section of the housing according tothe invention.

FIG. 3 is a front view and a partial section of the housing according tothe invention.

The slide rule housing according to the present invention comprisesprimarily a substantially stiff shaperetaining casing of syntheticmaterial having an open end edapted to be closed by a cap of flexiblematerial, preferably leather. The cap may be designed in the form of aflap having one end connected to the casing by means of the back side ofa loop. In this way the advantages of the capless flap-closable sliderule casing (easy and fast opening and non-detachable cap) is combinedwith the advantages of a stiff synthetic casing provided with a cap(increased protection against damage, low cost and easy cleaning).

More specifically, referring to the drawing, the housing illustratedtherein comprises a casing 1 of synthetic ma- 3,442,314 Patented May 6,1969 terial which is relatively stiff but still sufiiciently elastic sothat an undue breaking of the material will practically be impossible.As synthetic material may be used for instance polyethylene. The casinghas substantially the cross section of a rectangle. The width of thecasing slightly increases from its closed lower end so as to facilitatethe insertion of the slide rule. Within the range of the closed end ofthe casing there are provided depressions 1b which limit the extent towhich the slide rule can be placed into the casing. The open end ofeasing 1 has a cutout 1e which permit an easy grasping of the insertedslide rule.

In the vicinity of the open end and in the narrow sides of casing 1there are provided depressions 1c and 1d. On each side of casing 1, therespective depression comprises a fiat portion 1c and a depressedrounded portion 1d. The

' portion 10 of the depression serves for receiving a loop 4 to bedescribed further below, whereas the portion 1d forms a rest for theslide rule in the casing by means of which the slide rule is heldlaterally. The portion 1d simultaneously serves as abutment for theslide so as to prevent the latter from sliding down into the casing.

The back side of the casing 1 is additionally provided with a boss 6formed thereon for receiving a supporting ring 3. Furthermore, the backof the casing has formed thereon preferably cylindrical protrusions 1aupon which the cap in the form of a flap 5 of flexible material,preferably leather, is placed, said flap being provided withperforations corresponding to the protrusions 1a. The said protrusionshave their end faces fused to the loop 4 likewise consisting ofsynthetic material, as for instance synthetic leather. The said loop 4as mentioned above, is located in the depressions 1c provided in thelateral portions of easing 1. The depressions 1c are preferably so deepthat the outer surface of said loop is substantially flush with theouter surface of the casing said portions.

The flap 5 which preferably consists of leather is folded over the openend of housing 1 and slipped between loop 4 and the top side ofhousing 1. In this way the housing 1 is safely closed. The closure caneasily be opened by pulling flap 5 out of loop 4 while no danger existsthat said flap will get lost.

The back side of flap 5 is provided with a perforation through whichextends the boss 6 to which the supporting ring 3 is fastened. This ringadditionally and simultaneously positions flap 5. While flap 5 ispreferably made of leather, it may also be made of other flexiblematerial, as for instance polyethylene, or a similar material.

It is, of course, to be understood that the present invention is, by nomeans, limited to the particular construction shown in the drawing.

What I claim is:

1. A housing, especially for slide rules, which includes: a casinghaving an approximately rectangular cross section and being open at thetop and closed at the bottom, said casing being made of a substantiallystiff shaperetaining synthetic material, a flap of flexible materialfirmly connected to the upper portion of said casing for selectivelyclosing and opening the upper end of said casing, and a loop extendingaround the upper portion of said casing and connecting said flap to saidcasing.

2. A housing according to claim 1, in which said fiap has one endthereof provided with perforations, while the 3 back side of said casingis provided with protrusions extending through said perforations andbeing connected to said loop.

3. A housing according to claim 2, in which said protrusions are fusedto said loop.

4. A housing according to claim 1, in which the rear side of said casingis provided with a boss extending through said flap, and which includesa supporting ring supported by said boss.

5. A housing according to claim 1, in which the nar- 1 row sides of saidcasing are provided with depressions for receiving said loop.

6. A housing according to claim 1, in which the outer wall of saidcasing at the lower portion thereof is provided with inwardly extendingprotrusions for forming an abutment for said slide rule to be receivedin'said casing.

References Cited UNITED STATES PATENTS 1,462,674 7/1923 White 150-52 XR2,000,337 5/1935 Keuffel 15052 2,565,680 8/1951 Feld 15052XR DONALD F.NORTON, Primary Examiner.

U.S. C1. X.R.

